Yellow azo-dyestuff capable of being chromed



Patented July 30, 1935 YELLOW AZO-DYESTUFF CAPABLE OF BEING CHROMED Erich Fischer, Bad Soden-on-the-Taunus, and.

Walter-Gmelin, 'Frankfort-on-the Main, Germany, assignm's to General Aniline Works,-lnc., New York, N. Y.,:a corporation of Delaware 1 =No Drawing. Application February 19, 1935,

' Serial No'.'7,298. In Germany October 27,1933 7 4 Claims.

The present invention relates to yellow azodyestuffs capable of being chromed; more particularly it relates to dyestuffs of the following general formula:

wherein R and R1 mean radicals of the benzene or naphthalene series at least one of which .contains at least one sulfonic .acid group and the benzene nucleus I may be further substituted.

We have found that valuable yellow azo-dyestuffs capable of being chromed may be obtained by combining the diiazo-compounds of bases of the following general formula wherein the benzene nucleus may contain further substituents, with pyrazolone derivatives of the general formula:

wherein R and R1 stand for radicals of the benzene or naphthalene series, at least one of which contains at least one sulfonic acid group.

The new dyestuffs dye the animal fibre tints which, when after-chromed, are distinguished by good fastness properties.

The dyestufls may also be used for preparing color lakes.

The following example serves to illustrate the invention, but'it is not intendd to limit it thereto; the parts are by weight:

137 parts of ortho-aminobenzoic acid are diazotized in the usual manner and combined with a solution, rendered alkaline by means of sodium carbonate, of 440 parts of a pyrazolone of the following constitution:

When the coupling is finished the dyestufi is worked up in the usual manner. -It dyes wool reddish-yellow tints which, when after-chromed with, for instance, potassium bichr-omate and sulfuric acid, are distinguished by very good proper-ties of fastness. p I p I g 1 The coupling may also be conducted, for instance, in the presence of sodium bicarbonate or sodium acetate.

Instead of the diazo-component, mentioned in the foregoing example, there may also be used the diazo compounds of, for instance, the following bases: -sulfo-Z-aminobenzene-l-carboxylic acid, 5-sulfo-2-aminobenzene-l-carboxylic acid, 4-chloro-2-aminobenzene-l-carboxylic acid, 3-chloro-2-aminobenzene-l-carboxylic acid, 3,5-dichloro-2-aminobenzene-l-carboxylic acid, 3-bromo-2-aminobenzene-1-carboxylic acid, 3-chloro-5-su1fonic acid-2-aminobenzene-l-carboxylic acid. 4-nitro-3-chloro-2-.aminobenzene 1 carboxylic acid.

The pyrazolone, used in the above example, may be replaced by others, for instance, by

furthermore by a pyrazolone derivative of either of the following constitutions:

There are obtained azo-dyestufis which possess the same good properties of fastness as the dyestuff obtained acoordingto the foregoing example. We claim: 1 1. The azo-dyestufis of the following genera formula:

OOOH

wherein R and R1 mean radicals of the benzene or naphthalene series at least one of which contains at least one sulfonic acid group and the benzene nucleus I may be substituted by halogen, nitro or sulfonic acid groups, forming, when dry, yellow powders and yielding on animal fibers yellow dyeings which, when after-chromed, possess very good fastness properties.

2. The azo-dyestuff of the following formula:

SOaH forming, when dry, a yellow powder and yielding on wool a reddish-yellow dyeing which, when after-chromed, possesses very good fastness properties.

3. The azo-dyestufi'of the following formula:

forming, when dry, 2. yellow powder and yielding on wool a yellow dyeing which, when afterchromed, possesses very good fastness properties.

4. The azo-dyestuff of the following formula;

COOH

forming, when dry, a yellow powder and yielding on wool a yellow dyeing which, when afterohromed, possesses very good fastness properties.

ERICH FISCHER. WALTER GMELIN. 

